Optimality
[計] 最佳性
??? 情景例句
I have always worn a clip-on bow tie.
我都是用夾上去的領結。
Have but few frieds,though many acquaintances.
結交可以多，朋友應宜少。
We want it to stay down the hole until we can lead it off in a controlled manner.
我們要讓石油留在井下，直到我們能用一種有控制的方法把它引上來為止。